The possible causes of yellow and cloudy urine are: first, urinary tract infection. After the infection, the urine can appear yellowish and contain bacteria or metabolites, shedding epithelium, etc., so the urine is cloudy. It is usually accompanied by symptoms such as frequent urination, urgent urination and painful urination, and it is recommended to carry out routine urine tests and urine culture tests to further confirm the diagnosis. Secondly, the urine can be yellow and slightly cloudy when the urine is concentrated. Most of them are accompanied by less water or more sweating, vomiting, diarrhea or elevated body temperature, resulting in excessive evaporation of water and concentrated urine, but not accompanied by urinary frequency, urinary urgency, painful urination and other symptoms of urinary tract irritation. The specific gravity of urine can be increased by routine urine examination, but it does not contain white blood cells and red blood cells, and the number of bacteria is normal. Third, taking drugs can cause yellow urine color and may appear cloudy. Such as taking an overdose of vitamin B, taking antibiotics of furans and sulfonamides. In particular, sulfonamide antibiotics may form crystals of sulfonamide in the urine and cause cloudy urine. The color of urine may return to normal after stopping the relevant medication and drinking more water appropriately.